ColumnRandomWrapperStarTable (Starjava Table API)

java.lang.Object
- uk.ac.starlink.table.WrapperStarTable
- - uk.ac.starlink.table.RandomWrapperStarTable
  - - uk.ac.starlink.table.ColumnRandomWrapperStarTable

All Implemented Interfaces:

StarTable
```
public class ColumnRandomWrapperStarTable
extends RandomWrapperStarTable
```
RandomWrapperStarTable which works by storing the data in a set of fixed length arrays. This will be more efficient on memory used than storing it in rows if some of the columns have a primitive type, but it may make reading slower.

Author:

Mark Taylor (Starlink)

See Also:

RowRandomWrapperStarTable

Field Summary
- Fields inherited from class uk.ac.starlink.table.WrapperStarTable
  baseTable

Constructor Summary

Constructors
Constructor Description

ColumnRandomWrapperStarTable(StarTable baseTable, int nrow)
Constructs a new table to store a given number of rows.

Constructors
Constructor	Description
`ColumnRandomWrapperStarTable(StarTable baseTable, int nrow)`	Constructs a new table to store a given number of rows.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`getRowCount()`	Returns the number of rows in this table, if known.
`protected java.lang.Object[]`	`retrieveStoredRow(long lrow)`	Retrieves the row stored by the `lrow`'th invocation of `RandomWrapperStarTable.storeNextRow(java.lang.Object[])`.
`protected void`	`storeNextRow(java.lang.Object[] row)`	Stores the next row encountered in the base table's row sequence.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class uk.ac.starlink.table.RandomWrapperStarTable
getCell, getColumnCount, getColumnInfo, getRow, getRowSequence, getURL, isRandom

Methods inherited from class uk.ac.starlink.table.WrapperStarTable
checkedLongToInt, getBaseTable, getColumnAuxDataInfos, getName, getParameterByName, getParameters, setName, setParameter, setURL, toString

- Constructor Detail
  - ColumnRandomWrapperStarTable
```
public ColumnRandomWrapperStarTable(StarTable baseTable,
                                    int nrow)
                             throws java.io.IOException
```
    Constructs a new table to store a given number of rows. The nrow argument supplied is the number that this table will have, which may or may not match that of the base table.
    
    Parameters:
    
    baseTable - base table
    
    nrow - number of rows in this table
    
    Throws:
    
    java.io.IOException
- Method Detail
  - getRowCount
```
public long getRowCount()
```
    Description copied from interface: StarTable
    
    Returns the number of rows in this table, if known. If the number of rows cannot be (easily) determined, a value of -1 will be returned.
    
    Specified by:
    
    getRowCount in interface StarTable
    
    Overrides:
    
    getRowCount in class RandomWrapperStarTable
    
    Returns:
    
    the number of rows, or -1
  - storeNextRow
```
protected void storeNextRow(java.lang.Object[] row)
```
    Description copied from class: RandomWrapperStarTable
    
    Stores the next row encountered in the base table's row sequence. This will be called up to getRowCount times with the contents of each row of the base table in sequence. Implementations should store it in some way that it can be retrieved by RandomWrapperStarTable.retrieveStoredRow(long).
    
    Specified by:
    
    storeNextRow in class RandomWrapperStarTable
    
    Parameters:
    
    row - the row to store
  - retrieveStoredRow
```
protected java.lang.Object[] retrieveStoredRow(long lrow)
```
    Description copied from class: RandomWrapperStarTable
    
    Retrieves the row stored by the lrow'th invocation of RandomWrapperStarTable.storeNextRow(java.lang.Object[]). This method will not be called with a value of lrow greater than or equal to the number of times storeNextRow has been called already.
    
    Specified by:
    
    retrieveStoredRow in class RandomWrapperStarTable
    
    Parameters:
    
    lrow - the index of the row to retrieve
    
    Returns:
    
    the lrow'th row to be stored by RandomWrapperStarTable.storeNextRow(java.lang.Object[])

Class ColumnRandomWrapperStarTable

Field Summary

Fields inherited from class uk.ac.starlink.table.WrapperStarTable

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from class uk.ac.starlink.table.RandomWrapperStarTable

Methods inherited from class uk.ac.starlink.table.WrapperStarTable

Constructor Detail

ColumnRandomWrapperStarTable

Method Detail

getRowCount

storeNextRow

retrieveStoredRow